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If you have the #6 wire, you can span a long way with little drop (120v, 50a in,100' = -3.95v = 116v) If you don't have it yet, a 75*c wire in #8 would work too (113.7v).

A lot of them can have 240v or 120.. If it's capable of being changed (like a jumper) and ran on 240v, it would clearly say. I had a large one that was only 120 and it simply had too much line loss to perform very well. After that, I look for the ones that can go either way (given a choice)...

Your #6 wire is plenty to handle it either way. Why would you not run this as a 240 (L1, L2, N and G) that is just 2 x 120V...like your house? No jumper. If you put the continuity meter on L1 and L2 and get no reading, then it should work fine Edit: I read back and see the idea of having...

Then do this....use an ohmmeter to see if L1 and L2 on the camper distribution box are connected. If they are connected, you have straight 120v and it can only be plugged into a 120v source. If they are open, you could have two seperate circuits that allow for connection to your 240 home...